Method of making closure parts to eliminate waste



R. B. BUIKOLT METHOD OF MAKING CLOSURE PARTS TO ELIMINATE WASTE Filed Aug. 1, 1954 Patented Oct. 1, 1935 UNITED STATES METHOD OF MAKING CLOSURE PARTS TO ELHMINATE WASTE Roman B. Bukolt, Stevens Point, Wis. Application August 1, 1934, Serial No. 737,989

2 Claims.

The invention relates to the manufacture of closures of the general type disclosed in my U. S. application Serial No. 719,961, filed April 10, 1934, and while closures of this type embody a lever- 5 and-toggle-action snap disk, the present invention relates only to formation of a closure disk to fit under the snap disk, and to a flanged retaining ring for the two disks. For this reason, it will be obvious that the same method may be 10 practiced in forming closures which do not include a snap disk but do embody a closure disk and a flanged retaining ring therefor.

The object of the invention is to provide a novel method whereby the closure disk and the 15 retaining ring therefor may both be formed from a single piece of sheet metal, without waste.

With the above object in view, the invention resides in the novel method hereinafter described and claimed and shown in the accompanying 20 drawing.

Fig. 1 is a sectional view showing a cap stamped from thin sheet metal and embodying a top and a side wall, the formation of this cap being the first step in forming the closure disk and flanged 25 retaining ring from a circular piece of sheet metal.

Fig. 2 is a vertical sectional view showing .the top out from the side wall of the cap so that said cut-out top constitutes the desired closure 30 disk.

Fig. 3 is a sectional view illustrating the portion of the cap which was previously joined to the closure disk, bent inwardly to provide a flange and showing the capside wall threaded,

35 so that this threaded side wall and its flange constitutes the desired retaining ring.

Fig. 4 is a sectional View showing a complete closure secured upon a container such as a fruit Jar.

40 The first step in practicing the method upon a circular piece of thin sheet metal to provide the desired closure disk and flanged retaining ring, is to press a cup 5 from the metal as shown in Fig. 1, said cup having a top 6 and a continuous 45 side wall I. Preferably, at the same operation with forming the cup, the top 6 is given the shape which is to be imparted to the completed closure disk, and the portion of the side wall I which joins the top 5, is slightly reduced in diameter 50 by tapering it as shown at B. In the present disclosure, the top '6 is given a shallow upwardly flared form as shown at 9 throughout the greater part of its area, is formed with a bead I near and concentric with its peripheral edge, and de- 55 clines to said peripheral edge from said bead, as

shown at II. The line of juncture between the. inclined top portion I I and the side wall 'I, is given the reference character l2 for reference hereinafter. The central portion of the top 6 is, in the present showing, provided with a depressed portion I3.

After forming the cap 5, its top 6 is cut out to provide the desired closure disk, and in the present showing, the cutting is done along the line I2 where the top 6 joins the reduced portion 8 of 10 the side wall I.

After cutting out the top 6 of the cap, the portion of the cap which was previously joined to said top, is bent inwardly to provide a flange I4. In the present showing, this flange is formed by inwardly bending the reduced tapered portion 8 of the cap side wall I. The side wall I and the flange I4 thereof constitute the flanged retaining ring for the disk 6 and in the present instance,

this retaining ring also holds a snap disk I5 in place (Fig. 4).

Either before or after forming the flange I4, the side wall I is pressed to provide it with screw threads It for attaching purposes, if the closure is to be used upon a threaded fastener such as an ordinary fruit jar I I.

By forming the closure disk and the flanged retaining ring in the manner herein disclosed, there is no waste of material whatever, so that inexpensive manufacture is greatly facilitated.

In Fig. 4, a sealing ring I8 of rubber or other desired material is shown resting upon the neck of the jar or other container II, the peripheral portion of the closure disk 6 rests upon this sealing ring, the snap disk I5 rests upon the bead I0 of the closure disk 6, and the flange I4 lies upon the peripheral portion of said snap disk I5. When a suitable tool is inserted through the opening I9 in the snap disk I5, and allowed to fulcrum upon the depressed portion I3 of the closure disk 6, said snap disk may be pried upwardly slightly past dead center, whereupon it will quickly snap upwardly to a released position, allowing easy unthreading of the retaining ring from the container. In applying the closure, the retaining ring is threaded upon the container with the snap disk I5 in its upwardly snapped released position. Then, this snap diskis downwardly snapped so that it fulcrums against the flange I4 and pushes downwardly upon the bead IIJ, causing intense compression of the sealing ring I8 against the closure neck to form a tight seal. Due to the thin nature of the closure disk 6, it may readily adapt itself to any imperfections in the neck of the container.

' be shaped differently than herein shown and the snap disk I 5 could be omitted, whereupon the flange l4 would lie directly upon the closure disk to hold it in position. This modification in coni struction is not considered a part of the present invention, nor is the structure shown in Fig. 4, but it is mentioned only to show that the method herein claimed is not restricted to use in producing the exact construction shown.

I claim:-

1. A method of making a sheet metal closure and a flanged retaining ring therefor, comprising the steps of pressing out a cap having a continuous side wall and a top and inclining the upper portion of said side wall inwardly to its line of juncture with said top, cutting the top from the side wall along said line of juncture to provide a closure receivable within the confines of said wall, inwardly bending the'previously inclined portion of said wall forming a flange to overlie flanged retaining ring.

the closure and threading said wall to provide the desired flanged retaining ring.

2. A method of making a sheet metal closure and a flanged retaining ring therefor, comprising the steps of pressing out a cap having a top and a continuous side wall, inclining the upper portion of said side wall inwardly to its line of juncture with said top; giving said top a shallow upwardly flared form from its central portion to a line spaced inwardly from and concentric with said line of junctureand outwardly and downwardly slanting the portion of the top between said lines, cutting said top from said side wall along said line of juncture to provide a closure receivable within the confines of said side wall, inwardly bending the previously inclined wall portion providing a flange to overlie the closure and threading said wall to provide the desired ROMAN B. BUKOL'I. 2o 

